This revised and updated book is written to inform the citizens on the nature, causes, and effects of air pollution. It is written in terms familiar to the layman with the purpose of providing knowledge and motivation to spur community action on clean air policies. Numerous charts and drawings are provided to support discussion of air pollution subjects. Materials covered include: air, weather, and pollution; the processes of pollution; pollutants: their state and source; pollutants: their chemical properties; the special pollution of radioactivity; the health effects of pollution; and pollution's other effects on animals, vegetation, the economy. A glossary of terms used in the field of air pollution control is provided for the leader and concludes the work. (RE)